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/*
* Copyright (c) 2020. Ant Group. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
package signer
import (
"crypto"
"crypto/rsa"
"crypto/sha256"
"crypto/x509"
"encoding/pem"
"io"
)
type Signer struct {
publicKey *rsa.PublicKey
}
func New(publicKey []byte) (*Signer, error) {
block, _ := pem.Decode(publicKey)
key, err := x509.ParsePKCS1PublicKey(block.Bytes)
if err != nil {
return nil, err
}
return &Signer{
publicKey: key,
}, nil
}
func (s *Signer) Verify(input io.Reader, signature []byte) error {
h := sha256.New()
_, err := io.Copy(h, input)
if err != nil {
return err
}
return rsa.VerifyPKCS1v15(s.publicKey, crypto.SHA256, h.Sum(nil), signature)
}
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